Enhanced Eye Tracking for Augmented or Virtual Reality Display Systems

2. The display system of claim 1, wherein the movable reflector comprises a diffractive grating, wherein the diffractive grating is configured to convert an incident beam of the polychromatic light from the light source into the pattern of light.

3. The display system of claim 1, wherein the movable reflector comprises a plurality of diffractive gratings, each diffractive grating configured to form a different light pattern for scanning across the eye.

4. The display system of claim 3, wherein the diffractive gratings are positioned on, or form part of, a MEMS mirror, and wherein the position information indicates an orientation of the MEMS mirror, the MEMS mirror being adjustable by the display system.

5. The display system of claim 1, wherein the light detectors are photodiodes, and wherein each light intensity pattern represents a plot of electrical current versus position information associated with a position of the movable reflector.

6. The display system of claim 1, wherein the light source is one of two light sources configured to output light to the movable reflector, wherein each of the light sources is configured to form a respective portion of the pattern of the light for scanning across the eye.

7. The display system of claim 1, further comprising a waveguide, wherein the waveguide is one of a stack of waveguides, wherein some waveguides of the stack have out-coupling optical elements configured to output light with different amounts of wavefront divergence than out-coupling optical elements of other waveguides of the stack, wherein the different amounts of wavefront divergence correspond to different depth planes.

9. The method of claim 8, wherein adjusting the position of the light pattern comprises moving a moveable mirror such that the light pattern is moved from a first portion of the eye to a second portion of the eye along an axis.

10. The method of claim 9, wherein the movable reflector comprises a diffractive grating, wherein the diffractive grating is configured to convert an incident beam of light from the light source into a light pattern comprising the pattern of light.

13. The method of claim 12, wherein comparing the obtained light intensity patterns with the stored light intensity patterns is based on comparing positions of peaks and/or valleys in the light intensity patterns.

16. The computer storage media of claim 15, wherein an orientation of the diffractive grating is adjusted such that the light pattern is moved from a first portion of the eye to a second portion of the eye.